My pool measures out pretty clean chemical wise but after vacuuming thoroughly I noticed a few hours later what looked like leaves in the bottom of my pool. I went to scoop it out with a net and it desolved when I got close. So I turned the pump on high and made ALL of it turn to dust hoping the filter would get it all. A few hours later more of it came back. I do have some trees around but have no idea what this stuff is. Is it pollen ? Is it dirt from the filter coming back in the pool ? When I look at the return I dont see anything coming out. Any suggestions as to what it may be ?